Cutting means for dispenser of sheet material



c. E. BUSSE 3,370,497

CUTTING MEANS FOR DISPENSER OF SHEET MATERIAL Feb. 27, 1968 2 Sheets-Shee 1 Jig/6%" B %ie/zcflfiwae YPOBERTL. KAHN ATTY Filed March 8, 1966 c. E. BUSSE 3,370,497

CUTTING MEANS FOR DISPENSER OF SHEET MATERIAL Feb. 27, 1968 2 Sheets-Sheet 2 Filed March 8, 1966 BY 6&16726624556 'EOBEBTL KAHN ATTY United States Patent 3,370,497 CUTTING MEANS FOR DISPENSER OF SHEET MATERIAL Clarence E. Busse, 34 Gxiord Drive, Lincolnshire, Deerfield, Ill. 60015 Filed Mar. 8, 1966, Ser. No. 532,656 9 Claims. (Cl. 83-455) This invention relates to a dispenser for handling thin sheet wrap in roll form. Examples of such material are aluminum foil having a thickness of about 1 or 2 mils, thin plastic sheet material usually of a thickness of substantially less than 1 mil, waxed paper and the like. Such sheet Wrap is readily available in rolls having a length up to about 18 or inches (the most popular size usually having a length of about 11 or 12 inches), and having a diameter of the order of from about 1 /2 to about 2 inches.

Rolls of wrap referred to above are frequently sold in paperboard cartons. The dispenser hereinafter disclosed and embodying the present invention is useful for handling such rolls of wrap and dispensing a desired wrap length. The new dispenser structure may include as a cooperating part a paperboard carton in which such wrap comes or may be independent thereof.

A dispenser embodying the present invention is characterized by simple mechanical construction. This makes possible the distribution of such dispenser in unassembled form although, as will be apparent later, the assembling cost will be very low. The component parts of the new dispenser are susceptible to quantity production at low unit cost. The invention provides a construction which makes possible easy and foolproof assembly by unskilled labor or by a purchaser of such dispenser and thus makes possible distribution at relatively low prices.

Conventional dispensers, even though manufactured of molded or extruded material, frequently require factory assembly. Generally, a dispenser for handling the wrap referred to above is not susceptible to assembly by simple automatic machinery and consequently involves a high cost in connection with hand assembly or design of special machinery. In addition, the packaging and distribution of such pre-assembled dispensers may be more expensive, both in cost and material, because of requirements of a pre-assembled dispenser. The new dispenser does ont require pre-assembly and permits of simple packaging, thus further reducing cost.

In my Patent No. 3,142,217, issued July 28, 1964, I have disclosed a dispenser provided with a plastic severing blade having desirable properties in connection with dispensing aluminum foil. The dispenser embodying the present invention may utilize the plastic severing blade of the above identified patent or may use a severing blade of steel for use with plastic sheet material.

The severing blades which may be used with the new dispenser embodying the present invention, as is the case with the dispenser in my previous patent, require that the severing blade be translatable along a path parallel to the length of a roll of wrap and also be movable toward or away from the sheet material upon which the blade is adapted to operate. While the dispenser in the patent referred to above, as distinguished from the plastic blade, is satisfactory and may be used with both plastic or steel blades, nevertheless the dispenser itself is relatively expensive to manufacture and assemble.

The commercial field in which such dispensers, as disclosed in the patent, move is extraordinarily competitive. Dispensers of the type for handling sheet Wrap in roll form must be so designed that they can be sold to the retail trade at low prices. Many such dispensers are offered as premiums by manufacturers of the wrap. Conse- 3,37,47 Patented Feb. 27, 1968 qnently, a successful dispenser requires excellent design for manufacturing as Well as user satisfaction. A cost dilferential at the manufacturing level of 1d will generally result in a price differential of between 3 and as much as Se at the retail level.

It is thus clear that the mechanical structure and properties of a dispenser are of the highest importance while at the same time satisfactory operation by a purchaser and a reasonably long life are essential for success. The requirements for low cost manufacture and satisfactory user operation have so far not been met by anything in the prior art for handling rolls of sheet metal. The invention hereinafter disclosed achieves the above objectives to a remarkable degree and makes it possible to put into the hands of a purchaser a simple and highly satisfactory dispenser at a price low enough so that wide distribution is possible.

The invention will now be described in connection with the drawings wherein:

FIG. 1 is a perspective view partly broken away of one form of dispenser embodying the present invention.

FIG. 2 is a transverse section of the dispenser of FIG. 1, but showing a roll of wrap being dispensed.

FIG. 3 is an enlarged detail illustrating how the guide rail can be removed from or inserted into position.

FIG. 4 is a detail showing a front elevation of the severing blade and handle in which it is supported.

FIG. 5 is an enlarged sectional detail on line 5-5 of FIG. 1, with wrap material added and shelf 1 narrowed.

FIG. 5A is a detail on line 5A5A of FIG. 5.

FIG. 6 is an enlarged perspective, with parts broken away of the yoke structure.

FIG. 7 is a perspective view partly broken away of a modified form of the invention wherein a paperboard carton in which the roll of wrappirn material is stored forms part of the entire dispenser structure.

FIG. 8 is a view on line 8-8 of FIG. 7 with the carton removed and with the yoke and slider removed.

FIG. 9 is a view on line 9 of FIG. 8.

FIG. 10 is a view on line 1 i10 of FIG. 8.

FIG. 11 is an enlarged perspective of an end of the wrap support shelf for both forms of the invention.

Referring first to FIGS. 1 to 6 inclusive and 11, the dispenser includes wrap roll supporting body 10 having cradle portion 11, front portion 12, rear portion 13 and end walls 14 and 15. This structure is preferably molded in one piece of suitable material. As an example, high impact polystyrene may be used although other materials having desired strength also may be used. The precise shape of dispenser body 10 is not important and will generally be dictated by molding considerations to provide strength with minimum plastic material and also to permit mounting.

Cradle portion 1 should be dimensioned to accommodate a roll of wrap. Such rolls come in various diameters, depending upon the yardage, and also come in various lengths. A popular length of roll for both alumimum and plastic wrap is about 12 and a diameter up to about from 2" to 3". The dispenser illustrated in FIG. 1 will accommodate a shorter roll.

Rear wall portion 13 of the dispenser body is provided with upwardly extending end portions 16 and 17 merging in end Walls 14 and 15 respectively. Upwardly extending rear wing portions 16 and 17 are provided with mounting apertures 18 and 19 to permit attachment. Other methods of mounting may be utilized or the dispenser may be loose, to be cradled in the hand when used.

Front wall portion 12 has shelf 21 extending forwardly and generally horizontally in the normal position of the dispenser. Shelf 21 has any desired Width (this is the dimension perpendicular to the dispenser length between end walls 14 and 15) and extends forwardly for a sufficient distance to accommodate elongated finger opening 22. Opening 22 in shelf 21 is large enough to permit a 'user of the dispenser to insert at least one finger from below shelf 21 and extending upwardly to raise wrap material above shelf 21 so that the wrap can be gripped and pulled forwardly for dispensing. Such a finger opening is convenient if the dispenser is to be held by hand rather than mounted on a wall. As a practical example, shelf 21 may have a width of about 1 /2. This shelf may be narrower and finger opening 22 may be omitted.

Shelf 21 hasv the forward portion thereof shaped to provide wrap support portion 25 upon which Wrap to be dispensed will lay during severing. The nature and function of wrap support portion 25 will be explained in conection with the severing means.

Handle 26 forms part of a slider severing means having slider body 27 provided with longitudinal T-shaped channel 28. Slider body 27 is long enough along the length of the dispenser body so that satisfactory sliding will be, provided. The slider body is preferably made of a suitable plastic, such as the material previously identified or different material. Nylon is excellent for the slider body as it permits smooth travel along rail 30.

Slider body 27 rides on T-shaped' guide rail 30 of plastic or aluminum or other suitable material. Some flexing of T-rail 30 is desirable in connection with assembly. Any material used will ordinarily have sufficient elasticity. Trail 30, as shown here, is oriented so that the T is normally in a generally upright position with the rail length generally horizontal. The T-shape is particularly desirable because of the strength and excellent cooperation with the remainder of the dispenser structure with minimum rail material. In the assembled form of the device, slider body 27 is slidable along T-rail 30.

Slider body 27 has bottom portion 32 disposed below the bottom of T-rail 30 and carries severing blade 33 depending therefrom. Blade 33 (FIG. 4) has cutting edges 34 and 35 at right angles to each other meeting at tip 36 and is supported in portion 32 of the slider body in any suitablefashion as by cementing or, where the blade is of plastic, by being integral therewith.

Blade 33 can be plastic having the structure more fully disclosed in my prior patent. Such a plastic cutting blade is highly efiicient for use on aluminum foil wrap or waxed paper. When the wrap is of plastic, it is preferred to have cutter blade 33 of steel with edges 34 and 35 having the same order of sharpness as a razor blade.

As an example, cutter blade 33 when of steel may have generally the same dimensions, as far as the length of cutting edges 34 and 35 are concerned, as in the plastic blade set forth in my prior patent. However, the thickness of blade 33, when this blade is of steel, is substantially less than the thickness of a plastic blade. Thus blade 33, when of steel, may have a thickness of about .025. The exact thickness of this blade, when of steel, is not important.

It is not essential for blade 33 to extend for a substantial distance below the bottom of slider body 27. Thus, in a practical device, blade 33- has its tip where edges 34 and 35 meet about below the bottompart of body 27 on the slider. It has been found that the portion of the blade projecting below wrap support shelf 25 to be described, generally about Va, is small enough so that little or no danger of cutting is involved where a steel blade is provided. This assumes that the thickness of yoke plastic through which the blade extends is not excessive. With a plastic blade, the blade penetration below shelf 25 can be increased if desired. The dimensions of blade given above may be increased if necessary.

T guiderail 30 is supported at its ends by yoke body 37. The yoke body has parallel laterally off-set front and rear rails 38 and 39 extending at each end somewhat beyond dispenser body end walls 14 and 15. Rails 38 and 39 are joined together at their endsby bridges 40. Each bridge includes T head support portion 42 having slot 43. At each end the shoulders of the T of guide rail 30 rest upon the tops of support portion 42 while the depending body 'of the T extends into slot 43. The bridge at each end of rails 38 and 39 has leaf 46- which extends upwardly and terminates in bifurcated claw 47. In the assembled dispenser, slider body 27' is dimensioned to ride along the top edges of rails 38 and 39. While it is not necessary to press down on slider 26 when cutting wrap for dispensing,

nevertheless users may do this. If slider body 27 normally clears the top of rails 38'and 39, the clearance will be small so that any downward force on slider body 27 will cause the slider body to engage the top of rails 38 and 39. These rails are strong enough to withstand the pressure of the slider body incident to general dispenser use.

The clearance between the bottom of claw 47 in the normal position of leaf 46 and the top of slotted support 42 accommodates the thickness ofthe head portion of T guide rail 30. By having leaf' 46 free of rails 38'and 39, except at the bottom of such rails, such leaf will have substantial flexibility. Each leaf 46 may be sprung outwardly along the length of rails 38 and 39 and with some springing of T guide rails 30, guide rail 30 can be assembled in the yoke as illustrated in FIG. 3.

Various changes in the shape and design of leaf 46 and claw 47 may be made to'provide for flexing. By moving T head support portion 42 closer to its cooperating leaf 46, it may be possible to rely on. flexing of T guide rail 30 alone. However, the arrangement illustrated and described is desirable in that substantial tolerances in length of T guide rail 30 may be accommodated.

Rails 38 and 39 have bottom flange portions 381: and 39a respectively extending laterally at right angles to the webs of rails 38 and 39. Flange portions 38a and 39a extend from both sides of the rail webs. Between the opposed inner edges of rail flanges 38a and 39a clearance slot 50 is provided through which the tip portion of cutter blade 33 can project.

Yoke body 37 -at the ends near bridges 40 has transverse reinforcements 49 which extend into yoke arms 51. Yoke arms 51 extend along the outer faces of end walls 14 and 15of the dispenser body and are pivotally secured at 52' to such end walls. The pivot mounting may be provided by a head on a yoke arm cooperating with an aperture in the dispenser'end wall, or vice versa, or any other suitable structure. The pivotal mounting'is so constructed that yoke arms 51 may be sprung laterally to release the yoke from the dispenser body.

The elongated yoke body has its bottom portion consisting of rail flanges 38a and 39a shaped so that the yoke body norm-ally can rest upon the upper surface of the wrap material to be dispensed and below the yoke body when dispensing wrap is shelf portion 25. Shelf 25 (FIG.=

11) has a number of grooves or troughs, including trough 53, accommodating severing blade 33. Severing blade 33 must project into trough 53 and below flanges 38a and 39a for dispensing. The cooperating faces of shelf 25 and flanges 38a and 39a maybe smooth or may be ribbed as illustrated. The ribbing may be provided for the purpose of clamping the wrap between opposed interlocking surfaces. 7

As has ben previously indicated, shelf 21 may be reduced, insofar as width is concerned, so that slider 27 can be closer to front Wall 12 of the dispenser, asin FIG. 5, finger hole 22 being thus omitted. The structure so far'described can be easily assembled by threading the slider body over T-rod 30, springing the T-rod into position as previously described and snapping yoke arms'51 in position over end walls 14 and 15' of the dispenser body.

When the yoke body is swung upwardly from shelf 25, the leading edge of the wrap may be gripped and pulled forwardly over shelf 25. The yoke structure and the edges of end walls 14 and 15 of the body. are so shapedthat the yoke body can be swung up above curved edges 56 of the end walls and be stopped by shoulders 57 on the edges of the end walls of the dispenser bod While the T-shaped guide rail is illustrated as having the T shoulders at the top with the outer surface generally horizontal when the yoke is in dispensing position and the dispenser is in a normal usable position, it is possible to orient the guide rail differently. For example, the T may be reversed with the external face of the shoulders of the T resting upon part 42 and the body of the T extending upwardly through the bifurcation of claw portion 47. In the event that the T is inverted, the bifurcation can be dimensioned to accommodate the body of the T. It is also possible to orient the T so that the shoulders of the T lie in a generally vertical plane when the yoke is in dispensing position and the support shelf is generally horizontal. The shoulders can either be toward the front or toward the back of the yoke structure. It is understood that the front of the yoke is the part facing an observer when looking at the dispenser in front elevation.

The T structure for the guide rail may be changed to a slotted tube or rod or any other suitable rail shape. The slotted tube will permit the slider body to be shaped so that a portion thereof can be disposed in the slot to lock the guide rail against rotation. In addition, the supports for the ends of such a slotted guide rail would require a claw shape for engaging the slot to prevent rotation of the guide rail in its supports. In general, the guide rail end supports and slider should be shaped so that the guide rail will not be rotatable in its supports and will permit the slider to be locked against movement, other than sliding movement, along the length of the guide rail.

Referring now to FIGS. 7 to 10 inclusive a modified structure is illustrated wherein paperboard carton 69 (in which wrap may come) can be used for storage of the wrap roll, For use with carton 60, yoke structure 37 generally illustrated in FIGS. 1 to 6 inclusive may be used, However, an auxiliary structure for wrap support corresponding to shelf 25 in FIG. 1 is provided, This auxiliary structure is auxiliary yoke 61 having arms 62 and 63 which normally engage the edges of end walls 60a and 69b of carton 60. Arms 62 and 63 are slotted at 64 to slip over the edges of the carton end walls. The outer sides of arms 62 and 63 have apertures 65 which are adapted to register with the pivot heads 52 on arms 51 of yoke 37. The yoke and auxiliary yoke structures illustrated in FIGS. 7 and 8 may have a length corresponding to the longest roll of wrapping material of the various lengths available to the general public, As an example carton 6% may have a length of 18" or somewhat greater for accommodating an 18 roll of wrap. A shorter roll of wrap may be used by disposing the shorter roll in long carton 60 or in a shorter carton 66 within large carton 60.

Auxiliary yoke structure 61 has the same general shelf structure as in FIG. 1. In order to accommodate shorter carton 66, such carton being shorter than the maximum size carton 69, front wall portion 79 of the auxiliary yoke has inner auxiliary front portion 71 which is adapted to lie on the inside of the top edge portion of carton 66. Thus, the auxiliary yoke provides a secondary yoke structure consisting of front portions 70 and auxiliary front portion 71 which is adapted to lie on opposite sides of the front edge of carton 66. If carton 60 of maximum length is to be used, auxfliary front portion 71 of the front wall structure should engage only part of the length of the front wall of carton 6G. Auxiliary front portion 71 should be short enough to lie within carton 66. Portions 79 and 71 are joined at the top by bight portion 73 which will overlie the top edges of cartons 6i and 66 and extend from an end arm 62 or 63 for reinforcement.

The construction illlustrated in FIGS. 7-10 inclusive will require the cover, which must extend along the length of the wrap roll, to be folded back or to be cut off in whole or in part. This is necessary to permit the auxiliary yoke to rest upon the carton or nested cartons along the long and adjacent short edges of the carton walls. Where a shorter carton is disposed within a longer carton, then the slotted parts of the auxiliary yoke should be able to accommodate the two thicknesses of carton material.

In all cases, the yoke and auxiliary yoke are susceptible to plastic molding technique. In addition, the shelf structure, which in one case is integral with a wrap roll container and another case is part of the auxiliary yoke, are easily moldable and can be assembled with no trouble or tools. Thus, the entire dispenser in the modifications disclosed is susceptible to quantity manufacture at low cost and can be assembled with ease without tools.

What is claimed is:

1. A dispenser for han ling wrap in roll form, said Wrap being of aluminum foil or other thin material, said dispenser including an elongated shelf upon which Wrap from a roll is supported during dispensing, means for supporting said shelf in predetermined relation to said roll of wrap material, said shelf being long enough to accommodate the full Width of the wrap, said shelf having one severing blade-accommodating trough longitudinally thereof, a yoke assembly including a yoke body and an arm at each end of said body extending laterally of said body, means for supporting said arms for swinging about a pivot axis parallel to, but laterally offset from, the shelf support trough, said yoke body in normal dispensing position being disposed immediately above said shelf and having a pair of spaced, parallel, laterally offset rails providing a clearance region between said rails, said clearance region in dispensing position of the yoke being disposed above and registering with said shelf trough, a guide rail supported at its ends only at the end portions of said yoke body, said guide rail extending in parallel relation to said shelf trough and above said laterally offset rails in the normal dispensing position of said yoke, a manually movable slider resting on said guide rail, said slider and guide rail being complementarily shaped so that said slider is capable of rnovin only along the length of said guide rail, a severing blade carried by said slider in depending relation and, in dispensing position, extending through the rail clearance region into the shelf trough said blade having two cutting edges at right angles to each other meeting in a tip, the two cutting edges lying in a flat plane which is parallel to and lies within the clearance region and shelf trough so that each cutting edge of said severing blade becomes the leading cutting edge at substantially 45 to the wrap material lying above said trough and below clearance region irrespective of the direction of slider travel along said guide rail, said clearance region and shelf trough being wide enough to permit the entry of said severing blade when said yoke is moved on its pivot axis down to said shelf, said means at each end of said yoke body for supporting said guide rail including a leaf having a claw at the end thereof, said leaf and claw normally cooperating with the end of said guide rail for locking the same into position by being springable to clear said guide rail end whereby said guide rail may be readily sprung into position, said yoke arms having sufficient spring to assemble said yoke on said shelf support structure whereby said yoke with its springable arms may be made in one piece and whereby said shelf and shelf support structure may be made in one piece.

2. The construction according to claim 1 wherein said slider is shaped to ride above the tops of said offset rails, said rails supporting said slider against slider pressure toward the wrap support shelf.

3. The construction according to claim 2 wherein said guide rail has a T-shape and wherein said claw and leaf structure engage the outer surface of the T shoulders for locking the guide rail in position.

4. The construction according to claim 3 wherein said guide rail support means at each end of the guide rail includes means for engaging the inner shoulder surfaces of the T.

5. The construction according to claim 4 wherein the support means is shaped so that the T shoulders lie in a generally horizontal plane in the normal dispensing position of the yoke and the claw carried by the leaf engages the external side of the T shoulders.

6. The construction according to claim 5 wherein said T in a normal dispensing position of said yoke has the shoulders of the T at the top.

7. The construction according to claim 1 wherein the means for supporting the shelf includes an auxiliary yoke, said first named yoke being pivotally secured to said auxiliary yoke and means for attaching said auxiliary yoke to a carton having a cover along the carton length to permit Wrap to be pulled from the roll, said attaching means engaging a long and two adjacent carton edges.

8. The construction according to claim 7 wherein said edge attaching means comprising slotted portions for extending outside and inside of the carton walls extending from said edges.

9. The construction according to claim 8 wherein the slotted portion engaging the long edge of the carton has that part thereof extending along the inside of the carton Wall shorter in length than the part engaging the outside of the carton wall whereby a second and shorter carton may be disposed within the first named carton so that the first carton may have maximum length for accommodating long rolls of wrap and yet readily accommodate a shorter and more popular carton length.

References Cited UNITED STATES PATENTS 2,823,969 2/1958 Traver et al. 836l4 X 3,142,426 7/1964 Busse '83649 X 3,222,972 12/1965 Fulton 83564 ANDREW R. JUHASZ, Primary Examiner. 

1. A DISPENSER FOR HANDLING WRAP IN ROLL FORM, SAID WRAP BEING OF ALUMINUM FOIL OR OTHER THIN MATERIAL, SAID DISPENSER INCLUDING AN ELONGATED SHELF UPON WHICH WRAP FROM A ROLL IS SUPPORTED DURING DISPENSING, MEANS FOR SUPPORTING SAID SHELF IN PREDETERMINED RELATION TO SAID ROLL OF WRAP MATERIAL, SAID SHELF BEING LONG ENOUGH TO ACCOMMODATE THE FULL WIDTH OF THE WRAP, SAID SHELF HAVING ONE SEVERING BLADE-ACCOMMODATING TROUGH LONGITUDINALLY THEREOF, A YOKE ASSEMBLY INCLUDING A YOKE BODY AND AN ARM AT EACH END OF SAID BODY EXTENDING LATERALLY OF SAID BODY, MEANS FOR SUPPORTING SAID ARMS FOR SWINGING ABOUT A PIVOT AXIS PARALLEL TO, BUT LATERALLY OFFSET FROM, THE SHELF SUPPORT TROUGH, SAID YOKE BODY IN NORMAL DISPENSING POSITION BEING DISPOSED IMMEDIATELY ABOVE SAID SHELF AND HAVING A PAIR OF SPACED, PARALLEL, LATERALLY OFFFSET RAILS PROVIDING A CLEARANCE REGION BETWEEN SAID RAILS, SAID CLEARANCE REGION IN DISPENSING POSITION OF THE YOKE BEING DISPOSED ABOVE AND REGISTERING WITH SAID SHELF TROUGH, A GUIDE RAIL SUPPORTED AT ITS ENDS ONLY AT THE END PORTIONS OF SAID YOKE BODY, SAID GUIDE RAIL EXTENDING IN PARALLEL RELATION TO SAID SHELF TROUGH AND ABOVE SAID LATERALLY OFFSET RAILS IN THE NORMAL DISPENSING POSITION OF SAID YOKE, A MANUALLY MOVABLE SLIDER RESTING ON SAID GUIDE RAIL, SAID SLIDER AND GUIDE RAIL BEING COMPLEMENTARILY SHAPED SO THAT SAID SLIDER IS CAPABLE OF MOVING ONLY ALONG THE LENGTH OF SAID GUIDE RAIL, A SEVERING BLADE CARRIED BY SAID SLIDER IN DEPENDING RELATION AND, IN DISPENSING POSITION, EXTENDING THROUGH THE RAIL CLEARANCE REGION INTO THE SHELD TROUGH SAID BLADE HAVING TWO CUTTING EDGES AT RIGHT ANGLES TO EACH OTHER MEETING IN A TIP, THE TWO CUTTING EDGES LYING IN A FLAT PLANE WHICH IS PARALLEL TO AND LIES WITHIN THE CLEARANCE REGION AND SHELF TROUGH SO THAT EACH CUTTING EDGE OF SAID SEVERING BLADE BECOMES THE LEADING CUTTING EDGE AT SUBSTANTIALLY 45* TO THE WRAP MATERIAL LYING ABOVE SAID TROUGH AND BELOW CLEARANCE REGION IRRESPECTIVE OF THE DIRECTION OF SLIDER TRAVEL ALONG SAID GUIDE RAIL, SAID CLEARANCE REGION AND SHELF TROUGH BEING WIDE ENOUGH TO PERMIT THE ENTRY OF SAID SERVERING BLADE WHEN SAID YOKE IS MOVED ON ITS PIVOT AXIS DOWN TO SAID SHELF, SAID MEANS AT EACH END OF SAID YOKE BODY FOR SUPPORTING SAID GUIDE RAIL INCLUDING A LEAF HAVING A CLAW AT THE END THEREOF, SAID LEAF AND CLAW NORMALLY COOPERATING WITH THE END OF SAID GUIDE RAIL FOR LOCKING THE SAME INTO POSITION BY BEING SPRINGABLE TO CLEAR SAID GUIDE RAIL END WHEREBY SAID GUIDE RAIL MAY BE READILY SPRUNG INTO POSITION, SAID YOKE ARMS HAVING SUFFICIENT SPRING TO ASSEMBLE SAID YOKE ON SAID SHELF SUPPORT STRUCTURE WHEREBY SAID YOKE WITH ITS SPRINGABLE ARMS MAY BE MADE IN ONE PIECE AND WHEREBY SAID SHELF AND SHELF SUPPORT STRUCTURE MAY BE MADE IN ONE PIECE. 